I see these flashes for canon, nikon ect have different part numbers for all the different camera, but is this to use it on the camera, and will any of the flash work as a off the camera flash or do it still have to be made for that camrea?

Well I just won one on ebay that fits the Sigma camera and not the Canon, I read a review that said it was compatible with SIGMA AF, NIKON AF, CANON AF, SONY AF, PENTAX AF and after I bidded, I then read, they all had different part numbers.

So now I got one of Sigma Electronic Flash EF 530 DG Super flashes for the Sigma AF,